In message , at 14:38:50 on Wed, 3 Feb
2016, Bryan Morris remarked:

I'm still confused about the apparent 2 types of step free access shown
on tube maps
One shows "Platform to street"
The other shows "Train to street"

On the assumption that passengers don't step directly onto a lift on
emerging from a train in option 2 , what exactly is the difference?

The difference is that in the former there isn't step-free access from
the train to the platform. Even if there is from the platform to the
street.

Step-free access isn't just about people in wheelchairs, but includes
those with luggage/prams/etc which they can cope with getting on and off
the one small step[tm] from a train, but not from the platform to the
outside.
--
Roland Perry